[lldb-dev] Adding D language demangling support

[Greg Clayton via lldb-dev]

There is no external demangling plug-in infrastructure at the moment, but you could add functionality that would allow it. No one is going to have D installed by default. Where do you expect your demangler dylib to live? Would you just add code that tries to locate the dylib in N places on the current system and try to dlopen it? Avoiding duplication and just not having the functionality at all unless something else is might not make it that useful. Is D stable? Is the mangling changing at all? Will you require a demangler to be vended with each new version of the tool? Are all previous demanglings still valid in newer versions? Can you figure out the version of the D from a compiled executable so that you might be able to locate one of 5 different installs of D and select the right one? Let me know what you use case is.

Greg

> On Sep 21, 2016, at 3:00 PM, Timothee Cour <thelastmammoth at gmail.com> wrote:
> 
> Is there a way to provide a hook (eg, via an extern(C) function, or using a dynamically loaded shared library) to do this, so as to simply reuse D's https://dlang.org/phobos/std_demangle.html and make sure it's always in sync with D's demangling instead of duplicating code
> 
> On Wed, Sep 21, 2016 at 10:24 AM, Greg Clayton via lldb-dev <lldb-dev at lists.llvm.org> wrote:
> It might be nice to add demangling support to llvm and then use it by modifying "Mangled::GetDemangledName()" in Mangled.cpp. This is where all demangling happens. Hopefully you have a great prefix that won't conflict with other languages "_Z" for C++, "_T" for swift. But the code in Mangled::GetDemangledName() will look at the prefix and attempt to demangle the name based on what prefix it starts with.
> 
> 
> > On Sep 21, 2016, at 5:52 AM, Johan Engelen via lldb-dev <lldb-dev at lists.llvm.org> wrote:
> >
> > Hi all,
> >   I recently looked into adding demangling support for D in LLDB, but got lost in the code.
> > (right now, basic D support is there with: https://reviews.llvm.org/D24794)
> >
> > I'd like some pointers to where demangling is done for the other languages, and to where I should add D support for it.
> >
> > Thanks a lot,
> >   Johan
> >
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